var Ball = JW.ObservableConfig.extend({
	x      : 0, // Number
	y      : 0, // Number
	r      : 10,   // Number
	speedX : 0,
	speedY : 0,
	accelX : 0,
	accelY : 0,
	
	getSpeed: function(){
		return Math.sqrt(this.speedX*this.speedX+
		this.speedY*this.speedY);
	}
	
});
